<!DOCTYPE html>
<html>
    <head>
        <style type="text/css"> 
            #div1{
                border-style: dotted;
                border-width: 5px;
                border-color: red;
                }
            #div2{
                border-bottom-color: blue;
                border-bottom-style: solid;
                border-bottom-width: 5px;
            }
        </style>
    </head>
    <body>
        <div id="div1">第一个div</div>
        <div id="div2">第二个div</div> 
    </body>
</html>